SKM 2021 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 15: Posters Magnetism IV

MA 15.8: Poster

Donnerstag, 30. September 2021, 13:30–16:30, P

Disentangling the Ultrafast Magnetization Dynamics in Magnet/Non-Magnet Bilayer Systems — •Jonas Hoefer, Martin Stiehl, Benjamin Stadtmüller, and Martin Aeschlimann — Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Kaiserslautern, Germany

In the last 20 years, different all-optical techniques based on the magneto-optical Kerr effect (MOKE) were employed to study the ultrafast magnetization dynamics of magnetic thin films, alloys and multilayer structures. While conventional time-resolved (tr) MOKE studies provided the insights into the microscopic mechanisms governing the loss of magnetic order in simple materials, tr-MOKE experiments with fs-XUV radiation provided an understanding of the element specific magnetization dynamics of composite materials. The most recent progress in tr-MOKE experiments is the implementation of the so-called C-MOKE approach. It utilizes the complex nature of the material specific Kerr response (KR) to disentangle the magnetization dynamics of magnetic/non-magnetic multilayer structures. A crucial ingredient for the separation of the magnetization dynamics of all layers is, however, the precise value of the KR of the transiently spin-polarized non-magnetic layers that is often only available from theory.

Here we present a new strategy to experimentally determine the KR of a transiently magnetized gold layer in a Permalloy (Py)/gold (Au) heterostructure after optical excitation. This allows us to disentangle the layer specific magnetization dynamics of both materials and thus to discuss the spin transport across the Py/Au interface.